CVE-2021-46703 : Security Advisory and Response

A vulnerability in the IsolatedRazorEngine component of Antaris RazorEngine allows for the execution of arbitrary .NET code in a sandboxed environment.

Understanding CVE-2021-46703

What is CVE-2021-46703?

In the IsolatedRazorEngine component of Antaris RazorEngine through version 4.5.1-alpha001, it is possible for an attacker to execute arbitrary .NET code in a sandboxed environment if users can externally control template contents. This vulnerability specifically impacts products that are no longer supported by the maintainer.

The Impact of CVE-2021-46703

This vulnerability can lead to unauthorized execution of .NET code, potentially compromising the security and integrity of the affected systems that utilize the IsolatedRazorEngine component.

Technical Details of CVE-2021-46703

Vulnerability Description

The IsolatedRazorEngine component of Antaris RazorEngine allows attackers to execute arbitrary .NET code, posing a significant security risk.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions affected: All versions up to 4.5.1-alpha001

Exploitation Mechanism

The vulnerability can be exploited if users have the ability to manipulate template contents, enabling the execution of unauthorized .NET code.

Mitigation and Prevention

Immediate Steps to Take

Avoid using products that are no longer supported as they may expose systems to unpatched vulnerabilities.
Implement strict controls on user inputs to prevent malicious code execution.

Long-Term Security Practices

Regularly monitor security advisories for updates on unsupported products.
Conduct code reviews and security assessments to identify and address vulnerabilities proactively.

Patching and Updates

Ensure that all software components, including dependencies like Antaris RazorEngine, are kept up to date with the latest security patches and versions.